Over 99%. Less than 1 woman in 100 will get pregnant.
How it works
A small plastic device that releases the hormone progestogen
into the body - prevents sperm meeting an egg.
Advantages
Works for 5 years but can be taken out at any time. Periods
will be much lighter and usually less painful. You don't have
to think about contraception for as long as the IUS is in place
- on removal fertility returns to normal.
Disadvantages
Irregular light bleeding between periods is common for the
first 3 months. Temporary side effects such as headaches, spotty
skin, breast tenderness. Very small chance of infection in first
3 weeks.
Intrauterine
device
Effectiveness
Around 99%. Less than 1 to 2 women in 100 will get pregnant
in a year.
How it works
A small plastic and copper device is put into the womb. It
stops sperm meeting an egg or implanting in the womb.
Advantages
Works as soon as it is put in. Can stay in 3 to 10 years depending
on type - but can be removed at any time. You don't have to
think about contraception for as long as the IUD is in place
- on removal fertility returns to normal.
Disadvantages
May not be suitable for women at risk of getting STI's. Periods
may be heavier or longer and more painful. Very small chance
of getting an infection in the first 3 weeks.
